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26 Cards in this Set
- Front
- Back
What are the two types of wave? |
Transverse and Longitudinal |
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What's a Longitudinal wave? |
A wave where the medium moves in the same direction the wave travels eg sound waves and seismic waves |
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What's a Transverse wave? |
A wave where the medium moves at a right angle to the direction of the wave eg light and water waves |
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What is amplitude? |
The distance from the midpoint to the top of a crest or bottom of a trough measured in metres. |
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What is the wavelength? |
The distance between two identical points on adjacent waves measured in metres . |
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What is the period? |
how long it takes for 1 complete wave to pass a point measured in seconds. |
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What is frequency? |
How many complete waves pass a point per second measured in hertz. |
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What is the wave equation? |
Wave speed = frequency x wavelength |
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How else can wave speed be worked out? |
Wave speed= distance÷time |
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What is the law of reflection? |
The angle of incidence is equal to the angle of reflection |
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What is refraction? |
The bending of a wave when it goes through another medium |
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What are the two types of reflection? |
Specular and Diffuse |
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What is Specular reflection |
It follows the law of reflection |
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What is diffuse reflection |
It doesn't follow the law of reflection |
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Why do waves refract? |
Because they change speed. |
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What is ultrasound |
Above human range of 20,000 hertz |
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What is infrasound |
Below human range of 20hertz |
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What is a real image? |
An image that can be projected onto a screen and formed by only converging lenses |
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What is a virtual image |
An image that cannot be projected onto a screen formed by diverging lenses and some converging lenses |
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Converging Lenses |
Thicker in the middle and waves come closer together when they refract through them |
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Diverging Lens |
Thinner in the middle waves grown further apart when refracted |
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What do waves do? |
They transfer energy and information without transferring matter |
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How is the velocity of sound in air measured? |
.... |
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State the human hearing range? |
20Hz-20 000Hz |
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How is speed of water ripples measured? |
M... |
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Jh |
Gg |